dontneedausername ,
- You cannot auto archives Turn Of for one user because this settings is org/Tenant wide.
- When you want to delete the Items from Archives just disabled it for that user and leave it for 30 days without enabling. After 30 days, enabled again and you will get fresh archival storage.
- You can delete Archives data via content Search but there are some limitations, at a time you can only delete 10 items so this method is not recommended and time consuming too.
There are different methods also, but that's totally depends on the scenario what kind of issues that you're facing or hurdles. If you can eloborate more than definately one of us can provide the best approach..
Thanks 👍